public class kehou3_2 {
	public static void main(String args[]) {
		int i,j;
		for(i=2;i<=100;i++) {
			for(j=2;j<=i/2;j++) {
				if(i%j==0)
					break;
			}
		if(j>i/2)
			System.out.println(" "+i+"是素数");
		}
	}
}
